Broke remover for paper machines



June 16, 1925.

T. E. DURHAM BROKE REMOVER FOR PAPER MACHINES Filed April 30 1924 2Sheets-Sheet 1 June 16, 1925.

T. E. DURHAM BROKE REMOVER FOR PAPER MACHINES Filed April 30 924 2Sheets-Sheet 2 described in detail.

Patented June 16, 19225.

- UNITED. si'r mg PATENT FFIQE.

THOMPSGN E; DURHAM, 033 SA'EY'L'I STE. MARIE, CANADA.

" FOR IAPER MACHINES.

Application: filed April 30, 1924-. Serial No. 710,136.

To, all whomit 91mg, concern: I Be it known that I, THOBE'PSON E. Dun-HAM, of Sault Ste. Marie, in the district of Algonia, Canada, a subjectof the King of Great Britain, have invented certain new. and useful.Improvements in Broke Removers for Paper Machines, of which thefollowing is a specification. v

This invention relates to paper making machines in which the paper afterpassing from the endless wire belt, commonly known as the wire )asses onto felt belts and 1S tends to encircle the upper press roll and isthrown about the room.

The object of the present invention is to provide means which may bethrown into operation at a moments notice to automatlcally removethebroken paper stock from the press roll and feed it away to one side to asuitable tank. For this purpose I provide the mechanism shown in theac-,

companying drawings in which Fig. 1 is a side elevation of part of thepaper machine provided with my improvements; 1

F ig. 2 a sectional elevation, partlybroken away; V

F'g. 3 a plan view of the doctor and conveyor mechanism; and

Fig. l a cross sectionaldetail of the doc tor and conveyor.

In the drawings like numerals of reference indicate corresponding partsin the different figures.

The machine being of ordinary construction, provided with the usualdriving mechanism, felt belts and press rolls, need not be The upperpress roll of a pair is indicated at 1, and 6 is the felt belt passingbetween the rolls. Adjacent the top of the upper press roll is a trough3, which is materially longer than the press roll and extends past eachend thereof. I11 this trough islocated a helical conveyor 1, which ispreferably increased in pitch towards the discharge end... Supportedfrom the trough is a doctor or scraper, which. ex.- tends close'uptotheperiphery of; the press roll 1.. Thisdoctor is preferably formed bycuttingout apart 20f the wall ofthe trough 3: and bending it downtowardsthe press roll, and by; securing thereto a wooden scraper blade 7with a bevelled frontedge,

the. upper surface of the scraper being-sub stan-tially tangential totheperiphery of the roll. The wet half-made paper encircling the pressroll is scraped off by the doctor and passes into the trough 3, alongwhich it is conveyed by the COID'GYOP 4 and deposited in the broke tank5. The increase in the pitch of the helical conveyor towards thedischarge end gives it an increased conveying capacity which enables itto take care of the increasing load towards the delivery end. Sprocketgearing is provided whereby the conveyor may be driven from any suitableshaft. I show for this purpose a sprocket wheel 9 on the conveyor shaft10 driven by a sprocket chain 11 from the shaft 12 of the lower pressroll. The control is by means of a clutch 13 provided with a shifter 14which is arranged to be operated from any convenient point, when troubleoccurs, by means of a sliding rod 15.

The device will be applied in connection with each pair of press rolls,if more than one pair is employed in the machine.

The instant trouble occurs resulting in the breaking of the web ofpaper, the operator pulls in the clutch 13 which starts the conveyor 10in operation to carry away the broke, scraped off by the doctor. As thelatter is always in position for use, any slight delay in starting theconveyor is immaterial.

What I claim is 1. The combination with a paper machine provided withpress rolls of a doctor extending into close proximity to the peripheryof the upper press roll; a transverse trough behind the doctor adaptedto receive the broke; and a helical conveyor located in said trough, thepitch of the conveyor increasing towards the discharge end.

2. The combination with a paper machine provided with press rolls of atransverse trough located behind the top of the upper press roll andhaving an opening in its front wall substantially the width of the upperpress roll; a doctor extending into close proximity to the upper pressroll, said doctor ill comprising a scraper and a supporting member, towhich the scraper is secured, connected with the trough along the loweredge of the opening in the front of the trough; and a transverseconveyor operating in said trough.

3. The combination with a paper machine provided with press rolls of atransverse trough located behind the top of the upper press roll andhaving an opening in its front wall substantially the width of the upperpress roll; a doctor extending substantially tangentially into closeproximity to the upper press roll, said doctor comprising a scraper anda supporting member, to Which the scraper is secured connecting with thetrough along the lower edge of the opening in the front wall of thetrough; and a trans verse conveyor operating 1n sald trough.

4-. The combination with a paper machine provided with press rolls of atransverse trough located behind the top of the upper press roll, saidtrough being longer than the press roll and extending past the endsthereof at each side and having an opening in its front substantiallythe width of the upper press roll; a doctor extending into closeproximity to the upper press roll connected with the trough along thelower edge of the opening; and a transverse conveyor operating in saidtrough.

Signed at Sault Ste. Marie, Ont, this 11 day of April, 1924.

THOMPSON E. DURHAM.

lVitnesses T. A. JoHNsoN, 1). P. REID.

